331022381 has 2 divisors, whose sum is σ = 331022382. Its totient is φ = 331022380.

The previous prime is 331022353. The next prime is 331022383. The reversal of 331022381 is 183220133.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 192959881 + 138062500 = 13891^2 + 11750^2 .

It is an emirp because it is prime and its reverse (183220133) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 331022381 - 2¹⁸ = 330760237 is a prime.

It is a super-2 number, since 2×331022381² = 219151633445818322, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 331022383, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (331022383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165511190 + 165511191.

It is an arithmetic number, because the mean of its divisors is an integer number (165511191).

Almost surely, 2^331022381 is an apocalyptic number.

It is an amenable number.

331022381 is a deficient number, since it is larger than the sum of its proper divisors (1).

331022381 is an equidigital number, since it uses as much as digits as its factorization.

331022381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 331022381 is about 18194.0204737710. The cubic root of 331022381 is about 691.7552322712.

The spelling of 331022381 in words is "three hundred thirty-one million, twenty-two thousand, three hundred eighty-one".